Doonesbury by Garry Trudeau for May 22, 1972
Transcript:
Phred: B.D., how is it that you yanks ever got involved here?...We were just minding our own business, having a little civil war, when...bam, F-100s! How do suppose you would have liked it if during your civil war, 540,000 Viet Cong suddenly occupied Pennsylvania and New York? B.D.: Yeah, that is a weird thought... Phred: You bet it is! Can you imagine me giving chewing gum and chocolates to the children of Gettysburg?
Darn good questions.